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Frame of reference for Fermi Golden Rule

  1. May 27, 2012 #1
    Hi guys. I am currently studying Sub-atomic physics and it seems to me that there are different formulas that work in different frame of reference.

    In particular, I would like to ask:

    1. Which frame should we use in applying Fermi's Golden Rule? (I've read somewhere that the matrix element is invariant, but I assume the density of states must be frame dependent)

    2. The resolution of a probe is defined by its de Broglie wavelength. Once again, this is frame dependent, so which frame should we use to determine a probe's resolution.

    3. Is there a general rule of thumb when deciding which frame to use when applying a formula? (It seems to me that most of the problems are done in Zero momentum frame, or is it?)

    Thank you so much guysss!
     
  2. jcsd
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